If you're one of those people who thinks they know everything about every celebrity, think again. (Unless you happen to know who Ella Maria Lani Yelich-O'Connor is.)
Dozens of stars opt to change their real names before they are famous, choosing to go by more unique or interesting monikers. For instance, dear old Miley Cyrus was born Destiny Hope Cyrus, but officially changed her name in January 2008.
Here are some other celebrities whose real names will surprise you:
Laura Jeanne Reese Witherspoon aka Reese Witherspoon
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Nikolina Konstantinova Dobreva aka Nina Dobrev
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Eric Marlon Bishop aka Jamie Foxx
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Katherine Litwack aka Kat Dennings
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Karen Lucille Hale aka Lucy Hale
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Ella Maria Lani Yelich-O'Connor aka Lorde
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Carlos Irwin Estevez aka Charlie Sheen
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Emily Jean Stone aka Emma Stone
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Onika Tanya Maraj aka Nicki Minaj
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Peter Gene Bayot Hernandez aka Bruno Mars
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Audrey Perry aka Faith Hill
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Amanda Lee Rogers aka Portia De Rossi
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Elizabeth Grant aka Lana Del Rey
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Stefani Joanne Angelina Germanotta aka Lady Gaga
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Reginald Kenneth Dwight aka Elton John
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Tara Leigh Patrick aka Carmen Electra
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Declan Patrick MacManus aka Elvis Costello
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Katheryn Elizabeth Hudson aka Katy Perry
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Elizabeth Stamatina Fey aka Tina Fey
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Mark Vincent aka Vin Diesel
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Heather Sweet aka Dita Von Teese
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Ilyena Vasilievna Mironoff aka Helen Mirren
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Robyn Rihanna Fenty aka Rihanna
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Norma Jean Mortenson aka Marilyn Monroe
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Caryn Elaine Johnson aka Whoopi Goldberg
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